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SA-VK870EE
22.1.2. Troubleshooting Guide
Symptom
FL display blinking with
abnormal segment when
power ON the set or "F61"
First Power ON Display
immediate show "F61".
Power ON for a while then
only trigger "F61".
(Symptom always happen)
Power ON for a while and
then trigger "F76"
Checking Items
Check the soldering of the SMPS
P. C.B.
·
Is there any solder crack at area
(Q5860,Q5861, Q5862,TH5860,
QR5801)
·
Check all the supply line
·
Is there any solderability at area
of feedback circuit
·
Check feedback circuit (IC5801,
Q5802, D5806, PC5720, D5725)
Check Speaker output by using
multi-meter,
·
If there is a DC Voltage around
30V
·
Check Output IC (Pin 10 &
14) which have DC Voltage at
Speaker output short to
Vdd/Vss
·
If shorted that means D-Amp
damage already.
Check the fan connection &
feedback loop:
·
If the fan not proper connected,
"F61" will trigger when the
volume increase.
·
If the fan is not working, check
for fan circuit.
Check the soldering of the SMPS
P. C.B.
·
Is there any solder crack at area
(Q5860,Q5861, Q5862,TH5860,
QR5801)
·
Check all the supply line
Check all supply voltages as
follows:
Step 1: Check for supply voltages
from SMPS P. C.B to Power Supply
P. C.B at pin 2,5,6,7,8,9 of CN5802.
If there are supply voltages,
proceed to Step 2.
If no voltages detected, check wire
connection and circuitry connection
from SMPS P. C.B.
Step 2: Check if there is supply
voltages for Vp, FL1 & FL2
CN2807
·
If there is supply voltages of
+5V,+2.7V (For DVD), +6V
(SYS6V), +9V & +18V at
CN2807
·
If there is supply voltages of
9V at CN6001
Repair Items
Tou ch-up the solder crack area/
Change the defective parts.
·
Q5860,Q5861,Q5862,TH5860
(Tem perature Detect)
·
30V
QR5801 & QR5802 ( 30V
Detect)
·
Tou ch-up the necessary areas
·
IC5801, D5806, PC5720,
D5725
Change the defective parts.
D-AMP IC:
IC5000/IC5200
P/N = C1BA00000487
For Configuration
Refer to Table 1
Re-connect the Fan to CN2810
Fan
circuit: Q2942, Q2943,
Q2948 & Q2949
Touch-up the solder crack area/
Change the defective parts.
·
Q5860,Q5861,Q5862,TH5860
(Tem perature Detect)
·
QR5801 & QR5802 ( 30V
30V
Detect)
Feedback Circuit: IC5801,
PC5720, D5725
Check and change the possible
defective parts.
·
FP2901 (Fuse Protector),
T2900, D2901, D2906, D2908,
D2909
·
IC4000 (DC-DC Converter IC)
& related regulator circuit
components
·
IC4001 (DC-DC Converter IC)
& related regulator circuit
components
130
Remarks
SMPS
P. C.B.
Refer to
Fig. 1
D-AMP
P. C.B.
Refer to
Fig. 2
Main
P. C.B.
Refer to
Fig. 4
D-Amp
P. C.B.
Refer to
Fig. 2
Main
P. C.B.
Refer to
Fig. 4
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